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Useful for a variety of lab. demonstrations. These rheostats provide a variable resistance in electrical circuits. Oxidized constantan wire is wound on viterous enameled tube. Sliding contact carriage, mounted on the slide bar, carries a phosphor bronze contact for long life. 3 binding posts, one at each end of the winding and the other at the end of the slide bar for electrical connections. Resistance 125 Ohms, Max. Current 1.6 OhmsTube Size : 300 x 44 mm